// postage.c -- 一类邮资
#include<stdio.h>
int main(void)
{
    const int FIRST_OZ = 46;  //2013邮资首重
    const int NEXT_OZ = 20;   //2013邮资续重
    int ounces, cost;

    printf("    ounces cost\n");
    for (ounces = 1, cost = FIRST_OZ; ounces <= 16; ounces++, cost += NEXT_OZ)    /* += 把右侧的值加到左侧的变量上 */
        printf("%5d      $%4.2f\n", ounces, cost / 100.0);
    
    return 0;
}